Strip-Shaped Prism Light Guide Plate for Display View Angle
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Solution Overview
Problem
Liquid crystal displays face challenges of low view angle and low yield due to the limitations of traditional light guide plates used in backlight modules, which are designed to enhance brightness but compromise on these aspects.
Innovation Solution
An optical element with a light transmitting substrate featuring strip-shaped prisms arranged parallel to each other, where the refractive surface inclines gradually from the center to the edge, increasing the light propagation angle and improving the view angle of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism light guide plate with dot design is used to improve brightness, then the brightness of the display is improved, but the view angle becomes limited and the yield decreases
Solution Approach 1:
The light guide plate is segmented into multiple functional regions: a first light guide region with a first refractive index and a second light guide region with a second refractive index. This segmentation allows different regions to perform different optical functions, enabling both brightness enhancement and improved view angle simultaneously.
Solution Approach 2:
Different regions of the light guide plate are assigned different refractive indices to optimize local optical properties. The first light guide region has higher refractive index for effective light extraction and brightness, while the second light guide region has lower refractive index to reduce light reflection and improve view angle. This local quality differentiation resolves the contradiction between brightness and view angle.
2Illumination intensity
If traditional light guide plate design is used to achieve high brightness, then brightness is improved, but manufacturing yield becomes low
Solution Approach 1:
The invention changes the refractive index parameter across different regions of the light guide plate. By creating a gradient or stepped refractive index structure, the design optimizes light extraction efficiency while maintaining manufacturability, thereby improving both brightness and production yield.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively enhances the view angle and yield of the display device by ensuring light is emitted at an angle other than perpendicular to the surface, thereby addressing the limitations of traditional designs.
Implementation Method 1
a side of each strip-shaped prism close to a center of the light transmitting substrate has a refractive surface; from an end of the refracting surface close to the center of the light transmitting substrate to another end of the refracting surface close to an edge of the light transmitting substrate, the refracting surface inclines gradually
Data Source
AI summary
An optical element includes a light transmitting substrate which includes a first surface having strip-shaped prisms arranged parallel to each other. In a direction along which the prisms are arranged, a side of each prism close to a center of the light transmitting substrate has a refractive surface; from an end of the refracting surface close to a center of the light transmitting substrate to another end of the refracting surface close to an edge of the light transmitting substrate, the refracting surface inclines gradually along a direction away from the first surface. From the prism nearest to the center of the light transmitting substrate to the prism farthest to the center of the light transmitting substrate, an angle between the refracting surface and a normal of the first surface is gradually increased. A light guide plate, a prism, a backlight module and a display device are further provided.